WOW! What can I say.....if you haven't seen a Skidmark, it's hard to describe. The sparky motor certainly cannot be used under all conditions, it would be a fire hazard around dry grass. But, in the middle of a few thousand acres of black dirt, the spectacular motor can be used very safely. In addition to the visual effects, the motor has a very loud, low frequency roar. The flight was perfect and the rocket was recovered safely and undamaged. Max altitude was 14,188 feet, the highest flight of the day.